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gh-71141: Add note on rejecting "leading-dot" syntax for with statements (#96928) 

Co-authored-by: Daniël van Noord <13665637+DanielNoord@users.noreply.github.com>
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@ -703,6 +703,10 @@ This also has the side-effect of increasing execution speed because name
bindings are resolved at run-time in Python, and the second version only needs
to perform the resolution once.
Similar proposals that would introduce syntax to further reduce code volume,
such as using a 'leading dot', have been rejected in favour of explicitness (see
https://mail.python.org/pipermail/python-ideas/2016-May/040070.html).
Why don't generators support the with statement?
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